<ul class="breadcrumb">
  <li><a href="/"><i class="fa fa-home"></i>首页</a></li>
  <li class="active"><a href=""><i class="fa fa-warning"></i> 错误页</a></li>
</ul>
<div class="panel panel-warning">
  <div class="panel-heading"><i class="fa fa-warning"></i> 发生错误</div>
  <div class="panel-body">
    <?= $msg ?>
  </div>
  <div class="panel-footer">
    点击 <a href="<?= $url ?>">此处</a> 继续操作
  </div>
</div>